CD22859E, Dual-Tone Multifrequency (DTMF) Tone Generator IC, DIP-16

The CD22859E is a CMOS Dual-Tone Multifrequency (DTMF) Generator IC, designed for telephone dialing applications. It provides a highly stable tone generation system that directly interfaces with push-button telephone keypads, eliminating the need for external frequency generators.

The on-chip reference oscillator operates with a 3.579545MHz TV crystal, ensuring high-frequency accuracy. The IC generates dual-tone sinusoidal dialing tones using digital synthesis techniques. With on-chip mute control, the CD22859E can directly interface with external PNP transistors to mute audio transmission and reception during dialing.

Packaged in a DIP-16 form factor, the CD22859E is optimized for through-hole PCB mounting, making it ideal for telecommunication equipment, telephone dialing circuits, and embedded communication systems.

• Integrated DTMF Tone Generator: Generates standard dual-tone dialing signals for telephone and communication systems.
• Built-in Oscillator: Uses a 3.579545MHz TV crystal for high-accuracy and stable tone generation.
• Mute Control Logic: Includes TX and RX mute outputs, capable of controlling external transmitter and receiver muting transistors.
• Direct Interface with Telephone Keypads: Supports K500-type push-button telephone keyboards.
• Low Power Consumption: Operates efficiently on regulated DC or telephone loop current.
• DIP-16 Package for Easy Integration: Through-hole mounting for quick PCB prototyping and production use.